| 滇中易门地区古元古界易门群亮山组多细胞生物的年代学约束 |
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| 引用本文： | 李静,刘军平,孙柏东,刘桂春,胡绍斌,曾文涛,张虎,邓仁宏,俞赛赢.滇中易门地区古元古界易门群亮山组多细胞生物的年代学约束[J].地质通报,2018,37(11):2087-2098. |
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| 作者姓名： | 李静 刘军平 孙柏东 刘桂春 胡绍斌 曾文涛 张虎 邓仁宏 俞赛赢 |
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| 作者单位： | 云南省地质调查院, 云南 昆明 650216,云南省地质调查院, 云南 昆明 650216,云南省地质调查院, 云南 昆明 650216,云南省地质调查院, 云南 昆明 650216,云南省地质调查院, 云南 昆明 650216,云南省地质环境监测院, 云南 昆明 650216,云南省地质调查院, 云南 昆明 650216,云南省地质调查院, 云南 昆明 650216,云南省地质调查院, 云南 昆明 650216 |
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| 基金项目： | 中国地质调查局项目《云南区域地质调查片区总结与服务产品开发》（编号：DD20160345-02）、《云南1∶5万二街、易门、鸣矣河、上浦贝幅区域地质调查》（编号：DD20160017）和云南省科技领军人才培养计划项目《西南“三江”叠合成矿作用与成矿预测》（编号：2013HA001） |
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| 摘 要： | 滇中易门地区古元古界易门群亮山组中赋存有保存较好的多细胞生物化石,是大氧化事件,或广义的Lomagundi事件中生物与环境协同演化的产物。由于亮山组中普遍缺乏火山岩夹层及多期构造热事件的扰动,给精确测定这些多细胞生物的时代带来一定困难。以易门县铜厂地区罗洼垤组顶部灰白色凝灰岩1件、亮山组灰白色凝灰岩1件、粉砂质凝灰岩1件、灰黄色钙质粉砂质凝灰岩2件共5件样品260个锆石同位素测试结果为研究对象,结合区域构造热事件的分析,较准确地厘定了易门地区古元古界易门群亮山组中多细胞生物发育的时代为2.18～2.05Ga,与非洲加蓬Franceville地区发现的群居多细胞生物的时代一致,表明地球早期重大地质事件的同时性。
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| 关 键 词： | 古元古界易门群 亮山组 多细胞生物 锆石U-Pb年龄 同位素时钟重置 协同演化 |
| 收稿时间： | 2018/2/2 0:00:00 |
| 修稿时间： | 2018/3/16 0:00:00 |
Chronological constraints on multi-cellular organism fossil from Liangshan Formation of Paleoproterozoic Yimen Group in central Yunnan Province |
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| LI Jing,LIU Junping,SUN Baidong,LIU Guichun,HU Shaobin,ZENG Wentao,ZHANG Hu,DENG Renhong and YU Saiying.Chronological constraints on multi-cellular organism fossil from Liangshan Formation of Paleoproterozoic Yimen Group in central Yunnan Province[J].Geologcal Bulletin OF China,2018,37(11):2087-2098. |
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| Authors: | LI Jing LIU Junping SUN Baidong LIU Guichun HU Shaobin ZENG Wentao ZHANG Hu DENG Renhong and YU Saiying |
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| Affiliation: | Yunnan Institute of Geological Survey, Kunming 650216, Yunnan, China,Yunnan Institute of Geological Survey, Kunming 650216, Yunnan, China,Yunnan Institute of Geological Survey, Kunming 650216, Yunnan, China,Yunnan Institute of Geological Survey, Kunming 650216, Yunnan, China,Yunnan Institute of Geological Survey, Kunming 650216, Yunnan, China,Yunnan Institute of Geo-Environment Monitoring, Kunming 650216, Yunnan, China,Yunnan Institute of Geological Survey, Kunming 650216, Yunnan, China,Yunnan Institute of Geological Survey, Kunming 650216, Yunnan, China and Yunnan Institute of Geological Survey, Kunming 650216, Yunnan, China |
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| Abstract: | Multi-cellular organism fossils from Liangshan Formation of Paleoproterozoic Yimen Group in central Yunnan Province are special products of the co-evolution between early life on the earth and the environment in Great Oxygenation Event (GEO), or generalized Lomagundi Event. However, it is difficult to directerly determine the geological time when the multi-cellular organism lived, because of thegeneral lack of volcanic interlayer in Liangshan Formation and the perturbation of multi-period tectonic thermal events. In this paper, the authors accurately revealed that the multi-cellular organism lived 2.18~2.05Ga years ago, as shown by the 260 zircon grains isotopic testing results, from two incanus tuff samples at the top of Luowadie Formation and in Liangshan Formation respectively, an incanus silty tuff sample in Liangshan formation, two sallow calcareous silty tuff samples in Liangshan Formation, in Tongchang Township, Yimen County, in central Yunnan Province, in combination with regional tectonic thermal events analysis. This epoch is equal to that of multi-cellular organism, found in Franceville area, Gabonese Republic, Africa, suggesting that early important events on the earth had geological synchroneity. |
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| Keywords: | Paleoproterozoic Yimen Group Liangshan Formation multi-cellular organism zircon U-Pb age isotope clock reset co-evolution |
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